Method and system for driving a light emitting device display
A method and system for driving a light emitting device display is provided. The system provides a timing schedule which increases accuracy in the display. The system may provide the timing schedule by which an operation cycle is implemented consecutively in a group of rows. The system may provide the timing schedule by which an aging factor is used for a plurality of frames.
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This application is a continuation of U.S. patent application No. 15/090,769, filed Apr. 5, 2017, now allowed, which is a continuation of U.S. patent application No. 14/481,370, filed Sep. 9, 2014, now U.S. Pat. No. 9,330,598, which is a continuation of U.S. patent application No. 12/893,148, filed Sep. 29, 2010, now U.S. Pat. No. 8,860,636, which is a continuation of U.S. patent application No. 11/449,487, filed Jun. 8, 2006, now U.S. Pat. No. 7,852,298, which claims priority to Canadian Patent No. 2,508,972, filed Jun. 8, 2005, and Canadian Patent No. 2,537,173, filed Feb. 20, 2006, and Canadian Patent No. 2,542,678, filed Apr. 10, 2006,all of which are hereby incorporated by reference in their entireties.
FIELD OF INVENTIONThe present invention relates to display technologies, more specifically a method and system for driving light emitting device displays.
BACKGROUND OF THE INVENTIONRecently active-matrix organic light-emitting diode (AMOLED) displays with amorphous silicon (a-Si), poly-silicon, organic, or other driving backplane have become more attractive due to advantages over active matrix liquid crystal displays. An AMOLED display using a-Si backplanes, for example, has the advantages that include low temperature fabrication that broadens the use of different substrates and makes flexible displays feasible, and its low cost fabrication. Also, OLED yields high resolution displays with a wide viewing angle.
The AMOLED display includes an array of rows and columns of pixels, each having an organic light-emitting diode (OLED) and backplane electronics arranged in the array of rows and columns. Since the OLED is a current driven device, the pixel circuit of the AMOLED should be capable of providing an accurate and constant drive current.
For each row of the AMOLED display, the operating cycles include the compensation voltage generation cycle “C”, the VT-generation cycle “VT-GEN”, the current-regulation cycle “P”, and the driving cycle “D”. Typically, these operating cycles are performed sequentially for a matrix structure, as shown in
However, since the VT-generation cycle “VT-GEN” requires a large timing budget to generate an accurate threshold voltage of a drive TFT, this timing schedule cannot be adopted in large-area displays. Moreover, executing two extra operating cycles (i.e., “C” and “VT-GEN”) results in higher power consumption and also requires extra controlling signals leading to higher implementation cost.
SUMMARY OF THE INVENTIONIt is an object of the invention to provide a method and system that obviates or mitigates at least one of the disadvantages of existing systems.
In accordance with an aspect of the present invention there is provided a display system which includes: a pixel array including a plurality of pixel circuits arranged in row and column. The pixel circuit has a light emitting device, a capacitor, a switch transistor and a drive transistor for driving the light emitting device. The pixel circuit includes a path for programming, and a second path for generating the threshold of the drive transistor. The system includes: a first driver for providing data for the programming to the pixel array; and a second driver for controlling the generation of the threshold of the drive transistor for one or more drive transistors. The first driver and the second driver drives the pixel array to implement the programming and generation operations independently.
In accordance with a further aspect of the present invention there is provided a method of driving a display system. The display system includes: a pixel array including a plurality of pixel circuits arranged in row and column. The pixel circuit has a light emitting device, a capacitor, a switch transistor and a drive transistor for driving the light emitting device. The pixel circuit includes a path for programming, and a second path for generating the threshold of the drive transistor. The method includes the steps of: controlling the generation of the threshold of the drive transistor for one or more drive transistors, providing data for the programming to the pixel array, independently from the step of controlling.
In accordance with a further aspect of the present invention there is provided a display system which includes: a pixel array including a plurality of pixel circuits arranged in row and column, The pixel circuit has a light emitting device, a capacitor, a switch transistor and a drive transistor for driving the light emitting device. The system includes: a first driver for providing data to the pixel array for programming; and a second driver for generating and storing an aging factor of each pixel circuit in a row into the corresponding pixel circuit, and programming and driving the pixel circuit in the row for a plurality of frames based on the stored aging factor. The pixel array is divided into a plurality of segments. At least one of signal lines driven by the second driver for generating the aging factor is shared in a segment.
In accordance with a further aspect of the present invention there is provided a method of driving a display system. The display system includes: a pixel array including a plurality of pixel circuits arranged in row and column. The pixel circuit has a light emitting device, a capacitor, a switch transistor and a drive transistor for driving the light emitting device. The pixel array is divided into a plurality of segments. The method includes the steps of: generating an aging factor of each pixel circuit using a segment signal and storing the aging factor into the corresponding pixel circuit for each row, the segment signal being shared by each segment; and programming and driving the pixel circuit in the row for a plurality of frames based on the stored aging factor.
This summary of the invention does not necessarily describe all features of the invention.
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings wherein:
Embodiments of the present invention are described using a pixel circuit having a light emitting device, such as an organic light emitting diode (OLED), and a plurality of transistors, such as thin film transistors (TFTs), arranged in row and column, which form an AMOLED display. The pixel circuit may include a pixel driver for OLED. However, the pixel may include any light emitting device other than OLED, and the pixel may include any transistors other than TFTs. The transistors in the pixel circuit may be n-type transistors, p-type transistors or combinations thereof. The transistors in the pixel may be fabricated using amorphous silicon, nano/micro crystalline silicon, poly silicon, organic semiconductors technologies (e.g. organic TFT), NMOS/PMOS technology or CMOS technology (e.g. MOSFET). In the description, “pixel circuit” and “pixel” may be used interchangeably. The pixel circuit may be a current-programmed pixel or a voltage-programmed pixel. In the description below, “signal” and “line” may be used interchangeably.
The embodiments of the present invention involve a technique for generating an accurate threshold voltage of a drive TFT. As a result, it generates a stable current despite the shift of the characteristics of pixel elements due to, for example, the pixel aging, and process variation. It enhances the brightness stability of the OLED. Also it may reduce the power consumption and signals, resulting in low implementation cost.
A segmented timing schedule and a parallel timing schedule are described in detail. These schedules extend the timing budget of a cycle for generating the threshold voltage VT of a drive transistor. As described below, the rows in a display array are segmented and the operating cycles are divided into a plurality of categories, e.g., two categories. For example, the first category includes a compensation cycle and a VT-generation cycle, while the second category includes a current-regulation cycle and a driving cycle. The operating cycles for each category are performed sequentially for each segment, while the two categories are executed for two adjacent segments. For example, while the current regulation and driving cycles are performed for the first segment sequentially, the compensation and VT-generation cycles are executed for the second segment.
For each row, the timing schedule of
The timing schedule of
The programming of each segment starts with executing the first and second operating cycles “C” and “VT-GEN”. After that, the current-calibration cycle “P” is preformed for the entire segment. As a result, the timing budget of the VT-generation cycle “VT-GEN” is extended to j. τP where j is the number of rows in each segment, and τP is the timing budget of the first operating cycle “C” (or current regulation cycle).
Also, the frame time τF is Z×n×τP where n is the number of rows in the display, and Z is a function of number of iteration in a segment. For example, in
Similar to
The timing schedule of
According to the above addressing scheme, the current-regulation cycle “P” of each segment is preformed in parallel with the first operating cycles “C” of the next segment. Thus, the display array is designed to support the parallel operation, i.e., having capability of carrying out different cycles independently without affecting each other, e.g., compensation and programming, VT-generation and current regulation.
VT-generation occurs through the transistors 56 and 60, while current regulation is performed by the transistor 58 through the VDATA line. Thus, this pixel is capable of implementing the parallel operation.
Referring to
VT-generation occurs through the transistors 78, 80 and 82, while current regulation is performed by the transistor 84 through the VDATA line. Thus, this pixel is capable of implementing the parallel operation.
Referring to
The segmented timing schedule and the parallel timing schedule described above provide enough time for the pixel circuit to generate an accurate threshold voltage of the drive TFT. As a result, it generates a stable current despite the pixel aging, process variation, or a combination thereof. The operating cycles are shared in a segment such that the programming cycle of a row in the segment is overlapped with the programming cycle of another row in the segment. Thus, they can maintain high display speed, regardless of the size of the display.
A shared signaling addressing scheme is described in detail. According to the shared signaling addressing scheme, the rows in the display array are divided into few segments. The aging factor (e.g., threshold voltage of the drive TFT, OLED voltage) of the pixel circuit is stored in the pixel. The stored aging factor is used for a plurality of frames. One or more signals required to generate the aging factor are shared in the segment.
For example, the threshold voltage VT of the drive TFT is generated for each segment at the same time. After that, the segment is put on the normal operation. All extra signals besides the data line and select line required to generate the threshold voltage (e.g., VSS of
Since the VT-generation cycle is carried out for each segment, the time assigned to the VT-generation cycle is extended by the number of rows in a segment leading to more precise compensation. Since the leakage current of a-Si: TFTs is small (e.g., the order of 10−14), the generated VT can be stored in a capacitor and be used for several other frames. As a result, the operating cycles during the next post-compensation frames are reduced to the programming and driving cycles. Consequently, the power consumption associated with the external driver and with charging/discharging the parasitic capacitances is divided between the same few frames.
A display array to which the shared signaling addressing scheme is applied is divided into few segments, similar to those for
The timing schedule of
As shown in
Since τP (e.g., the order of 10 μs) is much smaller than the frame time (e.g., the order of 16 ms), the latency effect is negligible. However, to minimize this effect, the programming direction may be changed each time, so that the average brightness lost due to latency becomes equal for all the rows or takes into consideration this effect in the programming voltage of the frames before and after the compensation cycles. For example, the sequence of programming the row may be changed after each VT-generation cycle (i.e., programming top-to-bottom and bottom-to-top iteratively),
Referring to
Referring to
Referring to
Referring to
Referring to
Referring to
As shown in
Referring to
Referring to
According to the embodiments of the present invention, the operating cycles are shared in a segment to generate an accurate threshold voltage of the drive TFT. It reduces the power consumption and signals, resulting in lower implementation cost. The operating cycles of a row in the segment are overlapped with the operating cycles of another row in the segment. Thus, they can maintain high display speed, regardless of the size of the display.
The accuracy of the generated VT depends on the time allocated to the VT-generation cycle. The generated VT is a function of the storage capacitance and drive TFT parameters, as a result, the special mismatch affects the generated VT associated within the mismatch in the storage capacitor for a given threshold voltage of the drive transistor. Increasing the time of the VT-generation cycle reduces the effect of special mismatch on the generated VT. According to the embodiments of the present invention, the timing assigned to VT is extendable without either affecting the frame rate or reducing the number of rows, thus, it is capable of reducing the imperfect compensation and spatial mismatch effect, regardless of the size of the panel.
The VT-generation time is increased to enable high-precision recovery of the threshold voltage VT of the drive TFT across its gate-source terminals. As a result, the uniformity over the panel is improved. In addition, the pixel circuits for the addressing schemes have the capability of providing a predictably higher current as the pixel ages and so as to compensate for the OLED luminance degradation.
According to the embodiments of the present invention, the addressing schemes improve the backplane stability, and also compensate for the OLED luminance degradation. The overhead in power consumption and implementation cost is reduced by over 90% compared to the existing compensation driving schemes.
Since the shared addressing scheme ensures the low power consumption, it is suitable for low power applications, such as mobile applications. The mobile applications may be, but not limited to, Personal Digital Assistants (PDAs), cell phones, etc.
All citations are hereby incorporated by reference.
The present invention has been described with regard to one or more embodiments. However, it will be apparent to persons skilled in the art that a number of variations and modifications can be made without departing from the scope of the invention as defined in the claims.
Claims
1. A method of driving a display system using a segmented addressing scheme, the display system comprising an array of pixel circuits divided into a plurality of segments driven according to the segmented addressing scheme, each of the plurality of segments including pixel circuits in more than one row of the array, each pixel circuit having a light emitting device, a drive transistor for driving the light emitting device to emit light, a capacitor, and a switch transistor for generating a threshold voltage of the drive transistor during a generating threshold voltage operation, the method comprising:
- simultaneously controlling the switch transistors in a plurality of pixel circuits in more than one row in a first segment of the plurality of segments of the array with shared control signals, to simultaneously generate the threshold voltages of the drive transistors in the plurality of pixel circuits in the first segment during the generating threshold voltage operation for the plurality of pixel circuits in the first segment, while controlling switch transistors of every pixel circuit of every segment of the plurality of segments other than the first segment to not generate threshold voltages.
2. A method as claimed in claim 1, wherein each segment includes a plurality of rows, the simultaneously controlling the switch transistors being executed consecutively for each segment in the plurality of segments.
3. A method as claimed in claim 1, further comprising:
- subsequently implementing simultaneously controlling the switch transistors of the first segment, after the simultaneously controlling the switch transistors is carried out in a second segment.
4. A display system comprising:
- an array of pixel circuits divided into a plurality of segments, each of the plurality of segments driven according to a segmented addressing scheme, each of the plurality of segments including pixel circuits in more than one row of the array, each pixel circuit having a light emitting device, a drive transistor for driving the light emitting device to emit light, a capacitor, and a switch transistor for generating a threshold voltage of the drive transistor during a generating threshold voltage operation; and
- a driver configured to implement the segmented addressing scheme using the plurality of segments including simultaneously controlling the switch transistors in a plurality of pixel circuits in more than one row in a first segment of the plurality of segments of the array with shared control signals, to simultaneously generate the threshold voltages of the drive transistors in the plurality of pixel circuits in the first segment during the generating threshold voltage operation for the plurality of pixel circuits in the first segment, while controlling switch transistors of every pixel circuit of every segment of the plurality of segments other than the first segment to not generate threshold voltages.
5. A display system as claimed in claim 4, wherein each segment includes a plurality of rows, the driver configured to simultaneously control the switch transistors consecutively for each segment in the plurality of segments.
6. A display system as claimed in claim 4, wherein the driver is further configured to simultaneously control the switch transistors of the first segment, after simultaneously controlling the switch transistors in a second segment.
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Type: Grant
Filed: Sep 27, 2017
Date of Patent: Aug 20, 2019
Patent Publication Number: 20180018919
Assignee: Ignis Innovation Inc. (Waterloo, Ontario)
Inventors: Arokia Nathan (Cambridge), Gholamreza Chaji (Waterloo)
Primary Examiner: Temesghen Ghebretinsae
Assistant Examiner: Sosina Abebe
Application Number: 15/717,043
International Classification: G09G 5/02 (20060101); G09G 3/3233 (20160101); G09G 3/3258 (20160101);